WO2008069150A1 - ガラス溶融装置 - Google Patents
ガラス溶融装置 Download PDFInfo
- Publication number
- WO2008069150A1 WO2008069150A1 PCT/JP2007/073244 JP2007073244W WO2008069150A1 WO 2008069150 A1 WO2008069150 A1 WO 2008069150A1 JP 2007073244 W JP2007073244 W JP 2007073244W WO 2008069150 A1 WO2008069150 A1 WO 2008069150A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- melt
- glass
- partition wall
- bubbles
- flow path
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/182—Stirring devices; Homogenisation by moving the molten glass along fixed elements, e.g. deflectors, weirs, baffle plates
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/225—Refining
Definitions
- the present invention relates to a glass melting apparatus that can cope with a small-scale production of molten glass used for manufacturing optical elements and the like, and in particular, has a high purity used for press molding of high-precision optical elements such as aspherical lenses.
- the present invention relates to a glass melting apparatus capable of supplying optical glass.
- Glass is obtained by heating and melting a raw material containing glass components such as SiO in a melting furnace.
- the conventional glass melting furnaces obtained from the above are limited to large tank-type melting furnaces that continuously process a large amount of glass in units of several tens of tons per day!
- the inside of the furnace is partitioned using a partition plate to regulate the flow of molten glass.
- the glass melting furnace of Patent Document 2 is provided with a clarification tank having a rectangular parallelepiped internal shape having a specific ratio of length, width and depth for the purpose of removing fine bubbles in the molten glass.
- the scale of the melting furnace affects the quality of the glass, and the larger the melting furnace, the easier it is to obtain high-quality glass. Therefore, when the melting furnace is downsized, in order to obtain a glass with the same quality as a large melting furnace, it is necessary to devise a structure so that sufficient defoaming is possible. There is a point.
- the technique disclosed in the above document is for obtaining a high-quality glass by improving the performance of removing bubbles in the molten glass.
- the present invention has been made in view of the above situation, and it is an object of the present invention to provide a glass melting apparatus capable of producing a small amount of high-quality glass that can be used for manufacturing optical glass in units of several tens of kilometers per day. And
- the present invention has improved defoaming efficiency, can provide high-quality glass for optical glass even when applied to a small tank type glass melting furnace, and is satisfactory even if the manufacturing tact time of glass is accelerated. It is an object to provide a glass manufacturing technology that can be clarified and a glass melting apparatus based on the technology.
- a glass melting apparatus a clarification tank for clarifying a glass melt obtained by melting a glass raw material, and the clarification tank And a partition wall that divides the flow path in the clarification tank so that the glass melt supplied to the meander flows in the clarification tank, and the flow path rises from upstream to downstream.
- the bottom of the clarification tank has an inclination.
- FIG. 1 is a horizontal sectional view showing a first embodiment of the glass melting apparatus of the present invention, and is a cross-sectional view taken along the line bb in FIG.
- FIG. 2 is a cross-sectional view taken along line aa showing a vertical cross section of the glass melting apparatus of Fig. 1.
- FIG. 3 is a horizontal sectional view showing a second embodiment of the glass melting apparatus of the present invention, and is a sectional view taken along the line d-d in FIG.
- Fig. 4 is a cross-sectional view taken along line cc showing a vertical cross section of the glass melting apparatus of Fig. 3.
- FIG. 5 is a vertical cross-sectional view showing a third embodiment of the glass melting apparatus of the present invention.
- FIG. 6 is a vertical sectional view showing a modification of the glass melting apparatus of FIG.
- Glass is obtained by heating a raw material containing glass components such as SiO in a melting furnace.
- Bubbles generated in the glass melt may be lifted by the growth and released from the surface of the melt, or may be dissolved in the molten glass and absorbed and contracted, but in any case, the glass melt is Due to the high viscosity, it takes time to complete the release and disappearance of bubbles.
- a clarification tank for clarification of a glass melt is configured to have a rectangular planar shape, and in a large glass melting furnace, the moving distance of the glass melt is long!
- the flow of the melt is slow, turbulence and local stagnation are likely to occur, resulting in variations in the quality of the melt, and the rise of bubbles slows in the part where the flow is slow.
- the melt needs to flow at a speed of. For this reason, the clarification tank requires a flow path having such a length that bubbles can be sufficiently removed while the melt flows at a speed of a certain level or more.
- the clarification tank is partitioned by a partition wall so that the melt flow meanders.
- a reciprocating meandering flow path can be formed by partitioning the space from the inlet to the outlet of the clarification tank using a plurality of parallel partition plates. Reduce the width of the channel By increasing the number of meandering reciprocations, the flow path becomes longer.
- the bottom surface of the clarification tank is inclined so that the flow path of the melt rises from the inlet side (upstream) to the outlet side (downstream), the melt flows as the melt progresses.
- the depth becomes shallower, corresponding to the bubble growth process.
- the rise of the flow path can be configured continuously or substantially stepwise depending on the shape of the bottom surface of the clarification tank.
- the structure in which the flow path rises from the upstream side to the downstream side is advantageous in that the flow of the glass melt is accurately controlled. Specifically, in order for the glass melt to travel along the flow path that rises due to the inclination of the bottom surface of the clarification tank, it is necessary that the melt level rises in accordance with the level of the bottom surface. That is, unless the liquid level of the glass melt rises due to the supply of the glass raw material, the glass melt does not move forward, and the melt advances to the front of the flow path according to the supply of the glass raw material. In other words, the supply of the glass raw material serves as a pressure for extruding the melt into the flow path, and the advance speed of the melt can be accurately adjusted by controlling the supply speed of the glass raw material.
- the flow rate of the glass melt can be adjusted based on the cross-sectional area perpendicular to the flow direction of the flow path (direction in which the melt flows) defined by the partition wall. Specifically, the narrower the flow path, the smaller the cross-sectional area and the faster the melt flow rate. Therefore, in a structure in which the flow path rises from upstream to downstream, if the width of the flow path is constant, the cross-sectional area of the melt decreases, so the flow rate of the melt increases. In order to make the melt flow rate constant, the cross-sectional area should be made constant by increasing the width of the flow path from upstream to downstream and widening it.
- the time for the glass melt to flow in the clarification tank is about 2 hours or more. It may be set in consideration of the setting of the manufacturing tact of the glass so as to have the length of the flow path.
- the height of the partition wall is set to be higher than the liquid level of the melt.
- a partition wall may be an obstacle to defoaming. Bubbles in the glass melt float in the melt and reach the liquid level. When there is a partition wall, bubbles in contact with the partition wall are difficult to collapse. Bubbles tend to accumulate near the boundary with the wall surface. For this reason, bubbles generated in the vicinity of the partition wall remain in contact with the partition wall, or even if they grow and float along the partition wall, they tend to gather and flow downstream without collapsing. In addition, it is difficult to accelerate the glass melt flow rate and production tact.
- the difference between the top of the partition wall and the liquid level of the melt should be greater than or equal to the size of the bubbles. Since the size of the bubbles present in the glass melt is at most several millimeters, the difference between the top of the partition wall and the liquid surface of the melt should be at least 1 mm, preferably at least 3 mm. However, at the part where the partition wall is lower than the melt surface, the melt is allowed to escape from the upstream side to the downstream side beyond the partition wall. The difference between the melt and the melt surface is about 40 mm or less, preferably about 9 mm or less.
- the partition wall it is desirable to arrange the partition wall so that the position of the lower part of the melt surface is not continuous along the direction to the inlet rocker outlet. Especially in areas where the flow direction of the melt changes (area where the flow path bends)! /, The height of the partition wall is lower than the liquid level of the melt! /, The part is the inlet / outlet It is preferable that the direction is not continuous.
- the partition wall that divides the flow path can be configured using a plurality of types of partition plates having a constant height, or can be configured using a partition plate integrally including a high portion and a low portion. Defoaming In terms of the improvement effect, it is preferable that the ratio of the portion of the entire partition wall is lower than the melt surface and the ratio of the portion is about 10% or more.
- the flow of the melt is preferably controlled. Therefore, it is preferable that the ratio of the low portion and the portion is about 50% or less in order to prevent contamination of the downstream melt due to the melt escape.
- the proportion of the melt higher than the liquid level is preferably about 50 to 90% of the entire partition wall! /. It is easy to change the design according to the situation if it is configured by combining the partition plate with the partition plate and lower than the melt liquid level! /.
- the unevenness and the through-holes described above are more positive if they are provided in a portion where the melt flow pressure against the partition wall is high, that is, in a region where the flow of the glass melt is perpendicular to or close to the wall surface of the partition wall.
- bubble growth and trapping can be promoted.
- the partition wall or the side wall of the clarification tank that divides the region in which the flow direction of the melt changes in the flow path of the glass melt the function of growing and capturing bubbles is easily exhibited. Encouraging the growth of bubbles in the initial glass melt, where bubbles are likely to be generated, is advantageous for improving defoaming properties. Therefore, the partition located at the uppermost stream in the flow channel and facing the melt flow at the initial stage of melting It is effective to provide unevenness or through holes in the wall.
- a member having fine irregularities or through-holes is arranged in a region lower than the glass melt liquid surface, in addition to the irregularities and through-holes provided in the partition wall. May be provided upstream of the flow path.
- FIGs. 1 and 2 show a first embodiment of a glass melting apparatus according to the present invention, in which a part of a partition wall defining a glass melt flow path is configured to be lower than a melt liquid level. Yes.
- This glass melting apparatus A has a melting and clarifying tank 1 and a homogenizing tank 2, and the melting and clarifying tank 1 and the homogenizing tank 2 are connected by a connection pipe 3.
- the melt clarification tank 1 has left and right side walls 9a, 9b, an upstream side wall 9c, and a downstream side wall 9d that are defined so that the horizontal cross section is substantially rectangular, and is provided by an input part partition plate 4 that is erected in the vertical direction.
- the material glass is divided into a charging part 5a for melting by heating and a refining part 5b for refining the liquefied glass melt. Glass raw material (cullet) g is charged from the cylindrical charging tube 5c of the melting and clarifying tank 1 to the charging unit 5a.
- the inside of the clarification part 5b is partitioned by a partition wall 6 standing vertically, and a flow path for the melt G is formed.
- a flow path for the melt G is formed.
- the homogenizing tank 2 is provided with an agitating blade 10 for stirring the glass melt G introduced from the melting and clarifying tank 1 through the connecting pipe 3 and homogenizing it sufficiently.
- the homogenization tank 2 is provided with outflow nozzles 11 and 12, and the glass melt G in the homogenization tank 2 is discharged after being adjusted to a temperature suitable for molding of FG (fine gob).
- the charging section 5a and the clarification section 5b are integrally configured as a melt clarification tank 1.
- the charging section 5a may be separated from the clarification section 5b, and the glass melt liquefied in the charging tank may be supplied to the clarification tank through a connection pipe.
- a plurality of heaters 13, 14, 15, 16, 17 are provided, and the heating temperature is suitable for each part.
- the temperature is adjusted appropriately. Specifically, the temperature of the heater 14 is controlled so that there is no unmelted glass raw material g in the melt clarification tank 1 and a temperature suitable for clarification, and the heater 15 is used as the glass melt in the connection pipe 3.
- the temperature is adjusted to a temperature suitable for eliminating the contained fine dust bubbles.
- Heater 16 is used to obtain the glass melt discharged from homogenization tank 2 as FG in the subsequent process so that the melt in homogenization tank 2 has a temperature suitable for stirring. The temperature is controlled so as to obtain a proper outflow state.
- a heat insulating material (not shown) is arranged around the heaters 14, 15, 16, and 17 so as to cover the entire glass melting apparatus A, and each part of the apparatus is kept warm. All of the melting and clarifying tank 1, the homogenizing tank 2, the connection pipe 3, the inlet partition plate 4, the partition wall 6, the nozzles 11 and 12, and the stirring blade 10 are made of platinum or a platinum alloy.
- the drain pipe 20 is provided in the charging section 5a of the melt clarification tank 1, and the glass does not normally flow without heating! /, But when the glass in the melt clarification tank 1 needs to be discharged. Used by heating. Since the bottom 7 of the melting and clarifying tank 1 is inclined, the glass power S drain pipe 20 can be completely removed during discharge.
- the partition wall 6 is composed of a partition plate that is higher than the liquid level of the melt G and a partition plate that is lower than the liquid level of the melt G.
- the upper ends of 6a, 6c, 6d, 6f and 6g are located above the liquid level of the melt G, and the upper ends of the partition plates 6b and 6e are located below the liquid level of the melt G.
- the lower ends of the charging portion partition plate 4 and the partition plates 6a to 6g are fixed to the bottom portion 7 of the melt clarification tank 1, respectively.
- the inlet partition plate 4 and the partition plates 6a to 6g are parallel to the upstream side wall 9c and the downstream side wall 9d, respectively, and one side end is fixed to the side wall 9a or 9b of the melt clarification tank 1 perpendicularly. The other side end is separated from the side wall 9b or 9a. Since the partition plates 6a to 6g are located at the partial force S away from the side wall 9a or 9b and alternately positioned from left to right from the upstream side to the downstream side, the flow path of the melt G is defined in a self-letter shape. The flowing melt G goes to the left and right Go meandering.
- the side end portion of the input portion partition plate 4 that is not fixed is curved toward the input portion 5a so as to draw a curve.
- the discharge port to which the connection pipe 3 is connected is provided in the central portion of the downstream side wall 9d, the discharge G is prevented from stagnation in the most downstream of the flow path.
- the flow downstream from the outlet may be closed, and the position of the discharge outlet may be provided at the corner on the diagonal line with the input pipe 5c to discharge the melt G from the most downstream of the flow path.
- the bottom portion 7 of the clarification portion 5b is a flat surface inclined so as to gradually rise from the upstream side toward the downstream side.
- the inlet partition plate 4 and the partition plates 6a to 6g are arranged in parallel with the upstream side wall 9c and the downstream side wall 9d of the melt clarification tank 1, and the level of the flow path is substantially from upstream to downstream. Since it rises in stages, the escape and mixing of the melt G downstream is suppressed by gravity, particularly in the vicinity of the side walls 9a and 9b. The depth of the melt G decreases gradually from upstream to downstream.
- the width of the flow path that is, the distance between the inlet partition plate 4 and the partition plates 6a to 6g gradually increases from the upstream side to the downstream side, and the cross-sectional area perpendicular to the flow direction of the melt G. Is approximately the same from upstream to downstream. Therefore, when glass raw material g is supplied to the charging unit 5a at a constant supply rate and the melt G is generated at a constant rate, the melt G keeps the flow path at approximately the same speed from upstream to downstream. Flowing. During this time, the depth of the melt G gradually decreases, so upstream, there is a depth that allows the microbubbles generated in the initial melt G to grow up to a size that is easy to defoam, and to rise downstream. Then, since melt G is shallow, defoaming is easy. Among the bubbles in the melt G, those that have grown in contact with the partition plates 6b and 6e are likely to float from the upper end of the partition plate located below the liquid surface.
- the inclination of the bottom portion 7 of the clarification portion 5b is changed so that the melt depth gradually decreases (the bottom surface continuously rises) at each stage of the flow path.
- the bottom portion 7 is formed in a zigzag folded shape rather than a flat surface.
- the flow path rise in the embodiment of FIGS. 1 and 2 can be configured such that the force bottom portion 7 which is substantially uniform as a whole is formed into a curved surface, and the rise degree can be changed depending on the position.
- FIGS. 3 and 4 show a second embodiment of the glass melting apparatus according to the present invention.
- the partition plate 61 that constitutes the partition wall 6 ′ that partitions the glass melt flow path! Is different from the first embodiment in that ⁇ 6n is fixed to the side walls 9a and 9b by being inclined from the vertical to the upstream side.
- the width of the flow path is the force that expands in stages as a whole.
- the melt G goes from upstream to downstream while repeating the fact that the flow velocity increases while flowing straight and then the flow velocity decreases while turning.
- the flow pressure when the straightly flowing melt G collides with the side walls 9a and 9b becomes high, and the flow stagnation hardly occurs in this vicinity.
- FIG. 5 shows a third embodiment of the glass melting apparatus according to the present invention.
- the dimensions and arrangement of the partition plates 6o to 6u constituting the partition wall 6 "that partitions the flow path of the glass melt are the same as those of the partition plates 6a to 6a of the first embodiment shown in FIGS.
- the same force as 6g The partition plates 6o, 6p, 6q, and 6t are different in that they have minute through holes h that have the function of growing and trapping bubbles,
- the partition plates 6o, 6p, and 6q mainly promote the bubble growth in the initial melt G, and the partition plate 6t from the middle stream mainly promotes the trapping and floating of the bubbles.
- the through holes of 6p and 6q may be replaced with minute irregularities, and such minute irregularities and through holes may be portions where the glass melt flowing out from the charging portion 5a collides with the partition plates 6a, 6h and 6o. 3 and 4 is excellent in promoting bubble growth at the portion where the melt collides with the side walls 9a and 9b of the embodiment shown in FIGS. Is more preferably preferably is less than 3mm instrument or less lmm. And is preferably 5mm or less as the diameter of the through hole, and more preferably is not more than lmm.
- FIGS. 6 (a) to (d) the partition plates 6a to 6g of the glass melting apparatus A in FIGS. Four examples are shown, which are changed to a partition plate having a portion higher and lower than the melt surface.
- (A) to (d) of FIG. 6 are views in which a vertical cross section along the inlet partition plate 4 of the melt clarification tank 1 is viewed from upstream to downstream, and the partition plate is replaced with the partition plate 6a.
- Fig. 6 (a) to (d) partition plates can be used in combination.
- the partition plate shown in FIG. 6 (c) or (d) may be used on the upstream side
- the cutting plate shown in FIG. 6 (a) or (b) may be used on the downstream side.
- the component composition of the glass after melting is roughly SiO: 41% by mass (hereinafter, mass% is abbreviated as%).
- the obtained mixed powder is melted in a platinum crucible at 1,250 ° C. over several hours, vitrified, stirred, poured out into water and dried to obtain a rough cullet.
- a platinum crucible at 1,250 ° C. over several hours, vitrified, stirred, poured out into water and dried to obtain a rough cullet.
- two kinds of cullet having a higher refractive index and a lower one are prepared, and the two cullets are mixed so as to obtain a desired refractive index, and the resulting mixture is mixed with glass. Used as a raw material for the following operations.
- Melting and clarification tank 1 is formed into a substantially rectangular parallelepiped type with a length of 410 mm, a width of 250 mm, and a height of 100 mm (the capacity of the melt of the clarification part 5b when the minimum depth of the glass melt G is 60 mm: about 8000 cc) Configured.
- the charging part 5a is integrated with the clarification part 5, and a cylindrical charging pipe 5c for charging cullet g is above the charging part 5a.
- the homogenization tank 2 is formed in a cylindrical shape, and is configured so that the capacity becomes lOOOcc with the stirring blade 10 inserted.
- the inner diameter of nozzles 11 and 12 is set to 8 mm.
- the temperature of the glass melting apparatus A is controlled by individually controlling the heaters 13, 14, 15, 16, and 17, and the inlet 5a and the clarifier 5b are 1, 250 ° C, and the connecting pipe 3 is 1, 100 °. C, homogenization tank 2 is adjusted to 1,050 ° C, and outflow nozzles 11, 12 are adjusted to 1,050 ° C at the outlet.
- glass stock cullet g is supplied to the input pipe 19, the cullet g melts in a few minutes and flows into the clarification section 5b through the curved section of the input section partition plate 4.
- 1 Melt G is sufficiently clarified by passing through the melting and clarification tank 1 at 250 ° C for about 2 hours, flows into the connection pipe 3, and the slight dust bubbles disappear, and flows out of the connection pipe 3.
- the glass melt is stored in the homogenization tank 2.
- the glass melt is cooled while being stirred by the stirring blade 10, and the homogenized melt gradually flows out through the outflow nozzles 11 and 12. From nozzles 11 and 12
- the total flow rate of the resulting glass melt is about 600cc / hour, and high-quality FG that can be fully used as an optical element molding material with no undissolved residue, bubbles or striae is obtained.
- the FG prepared and molded by the glass melting apparatus A can be used as a molding material for optical elements used in cameras, video cameras, digital cameras and the like.
- the present invention can be used as a small glass melting apparatus capable of providing a high-quality fine gob suitable for a precision press molding method.
- the glass material manufactured using the glass melting apparatus according to the present invention is a high-quality material that can provide a molded body that can be used as various optical elements without performing post-molding polishing or the like by press manufacturing. Since it is an optical element molding material, it can be used as a technique for improving the mass productivity of optical element manufacturing and providing an economically advantageous manufacturing method.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008548268A JPWO2008069150A1 (ja) | 2006-11-30 | 2007-11-30 | ガラス溶融装置 |
US12/474,385 US20090235694A1 (en) | 2006-11-30 | 2009-05-29 | Glass melting apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006323420 | 2006-11-30 | ||
JP2006-323420 | 2006-11-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/474,385 Continuation US20090235694A1 (en) | 2006-11-30 | 2009-05-29 | Glass melting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008069150A1 true WO2008069150A1 (ja) | 2008-06-12 |
Family
ID=39492045
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/073244 WO2008069150A1 (ja) | 2006-11-30 | 2007-11-30 | ガラス溶融装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090235694A1 (ja) |
JP (1) | JPWO2008069150A1 (ja) |
KR (1) | KR20090089349A (ja) |
CN (1) | CN101541693A (ja) |
WO (1) | WO2008069150A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012132471A1 (ja) * | 2011-03-31 | 2012-10-04 | AvanStrate株式会社 | ガラス板製造方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9611163B2 (en) * | 2014-03-05 | 2017-04-04 | Owens-Brockway Glass Container Inc. | Process and apparatus for refining molten glass |
JP2015189664A (ja) * | 2014-03-31 | 2015-11-02 | 旭硝子株式会社 | 清澄槽、ガラス物品製造装置、およびガラス物品の製造方法 |
US11697608B2 (en) * | 2019-10-01 | 2023-07-11 | Owens-Brockway Glass Container Inc. | Selective chemical fining of small bubbles in glass |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03183624A (ja) * | 1987-05-30 | 1991-08-09 | Sorg Gmbh & Co Kg | ガラス溶解炉 |
JPH0769648A (ja) * | 1993-09-02 | 1995-03-14 | Canon Inc | 硝子溶融炉 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8402298D0 (en) * | 1984-01-28 | 1984-02-29 | Asahi Glass Co Ltd | Glass |
EP0237604B1 (de) * | 1986-03-20 | 1990-01-24 | Beteiligungen Sorg GmbH & Co. KG | Energiesparendes Verfahren zum Schmelzen von Glas |
DE19939771B4 (de) * | 1999-08-21 | 2004-04-15 | Schott Glas | Verfahren zur Läuterung von Glasschmelzen |
-
2007
- 2007-11-30 KR KR1020097011091A patent/KR20090089349A/ko not_active Application Discontinuation
- 2007-11-30 CN CNA2007800442310A patent/CN101541693A/zh active Pending
- 2007-11-30 WO PCT/JP2007/073244 patent/WO2008069150A1/ja active Application Filing
- 2007-11-30 JP JP2008548268A patent/JPWO2008069150A1/ja not_active Withdrawn
-
2009
- 2009-05-29 US US12/474,385 patent/US20090235694A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03183624A (ja) * | 1987-05-30 | 1991-08-09 | Sorg Gmbh & Co Kg | ガラス溶解炉 |
JPH0769648A (ja) * | 1993-09-02 | 1995-03-14 | Canon Inc | 硝子溶融炉 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012132471A1 (ja) * | 2011-03-31 | 2012-10-04 | AvanStrate株式会社 | ガラス板製造方法 |
JP5456895B2 (ja) * | 2011-03-31 | 2014-04-02 | AvanStrate株式会社 | ガラス板製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2008069150A1 (ja) | 2010-03-18 |
CN101541693A (zh) | 2009-09-23 |
US20090235694A1 (en) | 2009-09-24 |
KR20090089349A (ko) | 2009-08-21 |
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